/*
 jChecs: a Java chess game sample 

 Copyright (C) 2006-2011 by David Cotton

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation; either version 2 of the License, or (at your option) any later
 version.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
 Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package fr.free.jchecs.swg;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;

/**
 * Composant d'affichage d'une liste de tâches, style XP.
 * 
 * @author David Cotton
 */
final class TaskPanel {
	/** Couleur du fond du composant. */
	private static final Color BACKGROUND_COLOR = Color.LIGHT_GRAY;

	/** Composant graphique externe. */
	private final JComponent _component;

	/** Composant graphique réél. */
	private final JComponent _taskPanel;

	/** Dernier des conteneurs imbriqués. */
	private JComponent _lastContainer;

	/**
	 * Instancie un nouveau composant d'affichage de tâches.
	 */
	TaskPanel() {
		_lastContainer = new JPanel(new BorderLayout(0, 8));
		_lastContainer.setBackground(BACKGROUND_COLOR);
		_lastContainer.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));

		_taskPanel = _lastContainer;

		_component = new JScrollPane(_taskPanel,
				ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
				ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
	}

	/**
	 * Ajoute une tâche à la suite de la liste.
	 * 
	 * @param pTache
	 *            Tâche à ajouter.
	 */
	void add(final TaskItem pTache) {
		assert pTache != null;

		_lastContainer.add(pTache.getComponent(), BorderLayout.NORTH);

		final Dimension taillePanel = _component.getSize();
		final int largeurComposant = pTache.getBestWidth() + 24;
		if (largeurComposant > taillePanel.width) {
			taillePanel.width = largeurComposant;
			_component.setSize(taillePanel);
			_component.setPreferredSize(taillePanel);
		}

		final JPanel suivant = new JPanel(new BorderLayout(0, 8));
		suivant.setBackground(BACKGROUND_COLOR);
		_lastContainer.add(suivant, BorderLayout.CENTER);

		_lastContainer = suivant;
	}

	/**
	 * Renvoi le composant graphique affichable.
	 * 
	 * @return Composant graphique.
	 */
	JComponent getComponent() {
		assert _component != null;
		return _component;
	}
}
